freebsd-dev/sys/arm64/coresight/coresight.c
Ruslan Bukin c9ea007c3b Complete the ACPI support for ARM Coresight:
o Parse the ACPI DSD (Device Specific Data) graph property and record
  device connections.
o Split-out FDT support to a separate file.
o Get the corresponding (FDT/ACPI) Coresight platform data in
  the device drivers.

Sponsored by:	DARPA, AFRL
2020-06-17 15:54:51 +00:00

127 lines
3.4 KiB
C

/*-
* Copyright (c) 2018-2020 Ruslan Bukin <br@bsdpad.com>
* All rights reserved.
*
* This software was developed by SRI International and the University of
* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
* ("CTSRD"), as part of the DARPA CRASH research programme.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <arm64/coresight/coresight.h>
static struct mtx cs_mtx;
struct coresight_device_list cs_devs;
int
coresight_register(struct coresight_desc *desc)
{
struct coresight_device *cs_dev;
cs_dev = malloc(sizeof(struct coresight_device),
M_CORESIGHT, M_WAITOK | M_ZERO);
cs_dev->dev = desc->dev;
cs_dev->pdata = desc->pdata;
cs_dev->dev_type = desc->dev_type;
mtx_lock(&cs_mtx);
TAILQ_INSERT_TAIL(&cs_devs, cs_dev, link);
mtx_unlock(&cs_mtx);
return (0);
}
struct endpoint *
coresight_get_output_endpoint(struct coresight_platform_data *pdata)
{
struct endpoint *endp;
if (pdata->out_ports != 1)
return (NULL);
TAILQ_FOREACH(endp, &pdata->endpoints, link) {
if (endp->input == 0)
return (endp);
}
return (NULL);
}
struct coresight_device *
coresight_get_output_device(struct endpoint *endp, struct endpoint **out_endp)
{
struct coresight_platform_data *pdata;
struct coresight_device *cs_dev;
struct endpoint *endp2;
TAILQ_FOREACH(cs_dev, &cs_devs, link) {
pdata = cs_dev->pdata;
TAILQ_FOREACH(endp2, &cs_dev->pdata->endpoints, link) {
switch (pdata->bus_type) {
case CORESIGHT_BUS_FDT:
#ifdef FDT
if (endp->their_node == endp2->my_node) {
*out_endp = endp2;
return (cs_dev);
}
#endif
break;
case CORESIGHT_BUS_ACPI:
#ifdef DEV_ACPI
if (endp->their_handle == endp2->my_handle) {
*out_endp = endp2;
return (cs_dev);
}
#endif
break;
}
}
}
return (NULL);
}
static void
coresight_init(void)
{
mtx_init(&cs_mtx, "ARM Coresight", NULL, MTX_DEF);
TAILQ_INIT(&cs_devs);
}
SYSINIT(coresight, SI_SUB_DRIVERS, SI_ORDER_FIRST, coresight_init, NULL);